<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Todo List</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul {
            list-style: none;
        }

        a {
            text-decoration: none;
            outline: none;
            color: #000000;
        }

        h1 {
            margin: 20px auto;
        }

        .container {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .container ul {
            width: 100%;
            max-width: 600px;
        }

        .container ul li {
            height: 40px;
            line-height: 40px;
            margin-bottom: 4px;
            padding: 0 6px;
            display: flex;
            justify-content: space-between;
            background-color: #d2d2d2;
        }
    </style>
</head>
<body>
<h1 class="container">Todo List</h1>
<div class="container">
    <ul>
        <li>
            <div>Hello World</div>
        </li>
    </ul>
</div>
</body>
</html>